Search: Herschel, John in correspondent 
Dollond, George in correspondent 
1840-1849 in date 
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From:
Sir John Herschel
To:
George Dollond
Date:
[15 December 1842]
Source of text:
TxU:H/L-0137; Reel 1054
Summary:

Sends description and drawings of JH's actinoscope. Requests estimate for time and expense of constructing it. Questions about clock mechanism and prisms.

Contributor:
John Herschel Project
From:
George Dollond
To:
Sir John Herschel
Date:
[19 December 1842]
Source of text:
TxU:H/M-0164; Reel 1087
Summary:

Papers arrived safely. Will report GD's opinion on these soon.

Contributor:
John Herschel Project
From:
George Dollond
To:
Sir John Herschel
Date:
[23 December 1842]
Source of text:
TxU:H/M-0165; Reel 1087
Summary:

Sees too many difficulties in optics of JH's proposed telescope. Can build mechanical portion, but not by March as JH requires. Cannot give estimate, because design is too novel.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
George Dollond
Date:
[25 December 1842]
Source of text:
TxU:H/L-0138; Reel 1054
Summary:

Regrets that GD cannot build JH's entire actinoscope. If GD can make at least mechanical components, JH will supply optics and clockwork. Can GD complete these [by end of March]? Funds are limited; please estimate cost.

Contributor:
John Herschel Project
From:
George Dollond
To:
Sir John Herschel
Date:
[27 December 1842]
Source of text:
TxU:H/M-0166; Reel 1087
Summary:

Will begin building components that JH identified as most immediately needed. Confirm scale of JH's drawings. Will send samples of prism glass for JH to inspect. Cannot yet estimate cost.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
George Dollond
Date:
[29 December 1842]
Source of text:
TxU:H/L-0139; Reel 1054
Summary:

Confirms scale of drawings [for JH's actinoscope]. Has found simple contrivance to replace clockwork. Will order lenses and prisms from Munich; all English glass has color aberrations.

Contributor:
John Herschel Project
From:
George Dollond
To:
Sir John Herschel
Date:
[3 January 1843]
Source of text:
TxU:H/M-0167; Reel 1087
Summary:

Suggests modifying square base of JH's telescope to round base. Estimates cost at £80 to £100.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
George Dollond
Date:
[4 January 1843]
Source of text:
TxU:H/L-0140; Reel 1054
Summary:

Approves GD's modification of driving wheel [for JH's actinoscope]. But GD's cost estimate exceeds total R.S.L. grant of £100. JH cannot approve more than £70; must have funds left for optics and clockwork mechanism.

Contributor:
John Herschel Project
From:
George Dollond
To:
Sir John Herschel
Date:
[6 January 1843]
Source of text:
TxU:H/M-0168; Reel 1087
Summary:

Refuses to risk GD's funds by giving cost estimate for unusual telescope, especially if R.S.L. expects GD to pay for any expenses over estimate. Regretfully stops manufacture of telescope.

Contributor:
John Herschel Project
From:
George Dollond
To:
Sir John Herschel
Date:
[21 August 1847]
Source of text:
RAS:JH Archive 10/5.35; Reel 9
Summary:

Gratitude for receipt of JH's Cape Results.

Contributor:
John Herschel Project