The high power binocular eyepiece is made in two forms, No. 3780, the straight model, and 
No. 3781, angular model. 
The straight model No. 3780 as ilJustrated on page 76 is suitable where the microscope is used 
at an inclined position. If used with the microscope vertical it increases the working height of the 
instrument and may lead to discomfort for the user. The angular model overcomes this as the 
prismatic attachment allows the binocular to be inclined at a convenient angle when the microscope 
is upright, as shown in the illustration page 76. This prismatic attachment is readily detachable, 
so that the possessor may use it in its angular form when his microscope is vertical, or the straight 
form when he inclines his instrument. 
A tubelength corrector is supplied to compensate for the extra optical path. 
Either form of binocular is suitable for attachment to any microscopes of our make and to 
many instruments of other makes. It is advisable for us to have the drawtube of the instrument 
to ensure that there are no obstructions, which would prevent its insertion. If the eyepiece 
size is not the standard size (‘917 in.) a small cost is entailed for adaption. 
No. 3780. High power binocular, straight model ... soe vs S6 Sits £10 10 0 
No. 3781. High power binocular, angular model _... oe at Bar ine 13 10 0 
No. 3782. Prismatic attachment, to convert straight model to angular model 3. 10.50 
ANGULAR EYEPIECE ATTACHMENT. 
When it is necessary to use a microscope vertically, the 
observer finds that his position when working, gives 
considerable discomfort. The angular eyepiece bends the 
No. 37:79: 
path of light so that the eyepiece projects from the micro- 
scope at a convenient angle for observation. It will accom- 
modate any power of eyepiece of the standard gauge (:917 
in.) and has a correction lens to compensate for the increased 
tube length. 
No. 3779. Angular eyepiece attachment. Suitable for i 
use with any standard (‘917 in.) eyepiece... fe S20 L iW 
atl 
