The boy's own book of indoor games and recreations : a popular encyclopædia for boys (1890)
Stables, Gordon, 1840-1910, Hutchison, George Andrew, 1841-1913 · Philadelphia : J.B. Lippincott · leaf 388
e eyepiece tube.Glue this block in the other end of tube.the field-lens inwards. Fig. 7. the brass stair-screws. Now get a piece of wood,circular, three inches diameter and one and a halfinches thick (a ribbon roller will do very well), andbore a hole right through the centre, one and aquarter… … Fig. 8.Push the brass tube in this hole withThe telescope can be focussed by pushing in or drawing ;84 HOW TO MAKE AN ASTRONOMICAL TELESCOPE. out the brass tube. Get a piece of deal eight inches long and three and a halfinches wide and two inches deep. Cut a groove along the top as Fig. 7, one…
Games · Amusements
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