[DOC] [TLE] Hans and Zacharias Jansen - A complete microscope history [PAR] 1638) was a Dutch spectacle-maker from Middelburg credited with inventing the 
first ... Although Zacharias Jansen's life was previously documented, many of the 
... father, Hans, must have played an important role in the creation of the 
instrument. ... of three draw tubes with lenses inserted into the ends of the 
flanking tubes. [DOC] [TLE] Who were Hans and Zacharias Janssen? | Reference.com [PAR] Hans and Zacharias Janssen were a Dutch father and son accredited with the ... 
Both lived in the Netherlands and were working with each other as spectacle. ... 
through experimenting with different lenses placed at the ends of tubes. ... 1595, 
Zacharias Janssen and his father, Hans, invented the first compound microscope. [DOC] [TLE] What is the Hans and Zacharias Janssen Cell Theory? | Reference ... [PAR] Hans and Zacharias Jansen greatly contributed to the various parts of this ... 
Zacharias Jansen, a Dutch spectacle maker, invented the first compound 
microscope around 1590. Hans Jansen, Zacharias's father, was believed to have 
assisted in the ... first microscope consisted of three draw tubes with lenses inside 
the ends. [DOC] [TLE] Optical microscope - Wikipedia [PAR] It is difficult to say who invented the compound microscope. The Dutch spectacle-
maker Zacharias Janssen is sometimes claimed to have invented it in 1590 (a... [DOC] [TLE] Optical microscope [PAR] Van Leeuwenhoek's microscopes consisted of a single, small, convex lens ... It is 
impossible to say who invented the compound microscope. Dutch spectacle-
makers Hans Janssen and his son Zacharias Janssen are often said to have 
invented the ... At the lower end of the microscope tube one or more objective 
lenses are... [DOC] [TLE] Optical microscope - McGill School Of Computer Science [PAR] Van Leeuwenhoek's microscopes consisted of a small, single convex lens ... and 
his son Zacharias Janssen are often said to have invented the first compound ... 
At the lower end of the microscope tube one or more objective lenses are ... To 
use this lens, a drop of immersion oil is placed on top of the cover slip, and the 
lens... [DOC] [TLE] Lentz Microscopy Collection - Yale School of Medicine [PAR] Corrective lenses were said to have been used by ... There is also some 
evidence that the compound microscope was invented by ... Photograph of 
microscope in Middelburg, Holland, attributed to Zacharias Jansen, c1595. The ... 
ends of the drawtubes; the eyepiece lens is bi-convex and the objective lens is 
plano-convex. [DOC] [TLE] Optical microscope - Frank's Hospital Workshop [PAR] spectacle-makers Hans Janssen and his son Zacharias Janssen are often said to 
have invented the first compound microscope in 1590, but this was a declaration 
... occhiolino or compound microscope with a convex and a concave lens in 1609
. .... the eyepiece and placing a piece of tracing paper over the end of the tube. [DOC] [TLE] History of Microscopes - Microscope.com [PAR] 1675: Enter Anton van Leeuwenhoek, who used a microscope with one lens ... 
1938: Just six years after the invention of the phase contrast microscope ... the 
Chinese viewed magnified specimens through a lens at the end of a tube, ... but 
we have to look elsewhere to uncover both the first light and compound 
microscope. [DOC] [TLE] Optical microscope - Wikipedia, the free encyclopedia - iSites [PAR] Oct 24, 2006 ... 1.2 Compound optical microscope ... small, convex lens mounted on a plate with 
a mechanism to hold the ... Hans Janssen and his son Zacharias Janssen are 
often said to have invented the first compound .... and placing a piece of tracing 
paper over the end of the tube. ... Both qualities are inversely. [DOC] [TLE] Microscopes facts, information, pictures | Encyclopedia.com articles ... [PAR] Get information, facts, and pictures about Microscopes at Encyclopedia.com. ... 
An optical microscope with two lenses is known as a compound microscope. ... 
Credit for this invention is often given to Hans Janssen, his son Zacharias 
Janssen, .... First the lenses are placed in the steel tubes, which make up the 
bodies of the... [DOC] [TLE] Microscopes - Biozentrum [PAR] instruments.

Question: Zacharias Janssen is said to have invented the compound this by placing convex lenses at both ends of a tube
Answer: Microscope