Question: Kotaro Honda was taught by what physicist who was a pioneer of Japanese physics during the Meiji period?

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Court uniform and dress in the Empire of Japan: The official court dress of the Empire of Japan (大礼服 , taireifuku ) , used from the Meiji period until the end of the Second World War, consisted of European-inspired clothing in the Empire style.  It was first introduced at the beginning of the Meiji period and maintained through the institution of the constitutional monarchy by the Meiji Constitution, and represented the highest uniforms in use at the time.  Uniforms for members of the kazoku peerage and civil officials were officially set.

KS Steel: KS Steel, a permanent magnetic steel with three times the magnetic resistance of tungsten steel, was developed in 1917 by the Japanese scientist and inventor Kotaro Honda.  KS stands for Kichizaemon Sumitomo, the head of the family-run conglomerate, who provided financial support for the research leading to KS Steel's invention.  Honda would go on to invent NKS steel in 1933 whose magnetic resistance is several times higher than that of KS Steel.

Umewaka Minoru I: Umewaka Minoru I (初世 梅若 実 , Shosei Umewaka Minoru , July 7, 1828 – January 19, 1909) , also Umewaka Rokurō LII (五十二世梅若六郎 ) , was a Noh actor of late Edo and early Meiji period Japan.  A prolific teacher of Noh in the Meiji period, he taught a variety of people including the painter Kōgyo, the writer Ezra Pound, and the scholar and art collector Ernest Fenollosa.  His diary, published under the title "Umewaka Minoru Nikki", spans much of his life, and records in great detail his activities and the world of Noh in the Meiji period.

Hantaro Nagaoka: Hantaro Nagaoka (長岡 半太郎 , Nagaoka Hantarō , August 19, 1865 – December 11, 1950) was a Japanese physicist and a pioneer of Japanese physics during the Meiji period.

Meiji Shrine Inner Garden: The Meiji Shrine Inner Garden (明治神宮内苑 , Meiji Jingū Naien ) or Yoyogi Gyoen is a public garden adjacent to Meiji Shrine and Yoyogi Park in Shibuya, Tokyo.  The garden was once part of the suburban residences of Katō Kiyomasa and later the Ii clan during the Edo period.  During the Meiji period, the garden came under the supervision of the Imperial Household Agency and named Yoyogi Gyoen (Yoyogi Imperial Garden) and was frequently visited by Emperor Meiji and Empress Shōken.  The garden contains a tea house, an arbour, a fishing stand and an iris garden.  It has an area of 83,000 square meters and is open to the public throughout the year.

Kotaro Honda: Kotaro Honda (本多 光太郎, "Honda Kōtarō", born on February 23, 1870 in Okazaki, Aichi Prefecture – February 12, 1954) was a Japanese scientist and inventor.  He invented KS steel (initials from Kichiei Sumitomo), which is a type of magnetic resistant steel that is three times more resistant than tungsten steel.  He later improved upon the steel, creating NKS steel.  The NKS steel was mentioned by Taiichi Ohno in his book, as being one of the Japanese materials development results after the Second world war.  He was awarded the Culture Award and the Big Asahi Ribbon of the First Class.  He was taught by the famous Japanese physicist Hantaro Nagaoka at the University of Tokyo.  He was one of the first persons to be awarded the Order of Culture when it was established in 1937, being conferred with the honor in 1951.  He was posthumously awarded the Grand Cordon of the Order of the Rising Sun.  He participated in establishing the (千葉工業大学, "Chiba Institute of Technology") from 1940.

Japanese mon (currency): The mon (文 ) was the currency of Japan from the Muromachi period in 1336, until the early Meiji period in 1870.  It co-circulated with the new sen until 1891.  The Kanji for "mon" is 文 and the character for currency was widely used in the Chinese-character cultural sphere, e.g. Chinese wen, Korean mun.  Throughout Japanese history, there were many different styles of currency of many shapes, styles, designs, sizes and materials, including gold, silver, bronze, etc.  Coins denominated in mon were cast in copper or iron and circulated alongside silver and gold ingots denominated in "shu", "bu" and "ryō", with 4000 mon = 16 shu = 4 bu = 1 ryo.  In 1869, due to depreciation against gold, the new fixing officially was set for 1 ryo/yen = equal to 10.000 mon.  The yen started to replace the old duodecimal denominations in 1870: in 3rd quarter of 1870, the first new coins appeared, namely 5, 10, 50 sen silver and 2,5,10,20 Yen.  Smaller sen coins did not appear before spring, 1873.  So the mon coins (1, 4, 100, 250 mon etc.) remained a necessity for ordinary peoples commodities and allowed to circulate until 1891.12.31.  Only from Jan. 1, 1954 onward the mon became invalid: postwar inflation had removed sen, mon etc. denominations smaller than 1 Yen.  Due to the missing small coinage, the Japanese posts e.g. issued their first stamps (Meiji 4.3.1/1871.4.20) in mon and fixed postal rates in mon until April, 1872 (Meiji 5.2.28).

Zenken Kojitsu: The Zenken Kojitsu (前賢故実 ) is a collection of biographies of Japanese historical figures by Kikuchi Yōsai, first published from the late Edo period into the Meiji period.  It consists of ten volumes and twenty books in total.  Moving through time from antiquity through the Nanboku-chō period, it contains portraits and rough biographies in kanbun of 585 Imperial family members, loyal retainers, and historical heroines.  It was groundbreaking for its visualizations of Japanese historical figures and has been treasured as a bible for historical art since the rise in national consciousness of the middle Meiji period.

Meiji period: The Meiji period (明治時代 , Meiji-jidai ) , also known as the Meiji era, is a Japanese era which extended from October 23, 1868 to July 30, 1912.  This period represents the first half of the Empire of Japan during which Japanese society moved from being an isolated feudal society to its modern form.  Fundamental changes affected its social structure, internal politics, economy, military, and foreign relations.  The period corresponded to the reign of Emperor Meiji after 1868, and lasted until his death in 1912.  It was succeeded by the Taishō period upon the accession of Emperor Taishō to the throne.

Toyoma Education Museum: Toyoma Education Museum exhibits the history of education in Japan since the Meiji period.  It is housed in the former Tome Elementary School Building (旧登米高等尋常小学校校舎 ) of 1888 in the city of Tome, Miyagi Prefecture.  The U-shaped two-storey building around a courtyard, lined with balconies and with half-hexagons at the end of each wing, was designed by Kisaburo Yamazoe.  It is representative of the western-inspired architecture of the Meiji period and in 1981 was designated an Important Cultural Property.

Supporting paragraphs: Kotaro Honda Hantaro Nagaoka
Answer: Hantaro Nagaoka